staging: speakup: Remove unnecessary space

This patch fixes the checkpath.pl warning:

ERROR: space prohibited before that ',' (ctx:WxE)
+       MSG_FIRST_INDEX ,

And removes the unnecessary space.

Signed-off-by: Bastian Plettner <b.plettner@archlinux.info>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>